5611221165 has 64 divisors (see below), whose sum is σ = 10153693440. Its totient is φ = 2621122560.

The previous prime is 5611221157. The next prime is 5611221169.

5611221165 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 5611221165 - 2³ = 5611221157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5611221169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2932249 + ... + 2934161.

It is an arithmetic number, because the mean of its divisors is an integer number (158651460).

Almost surely, 2^5611221165 is an apocalyptic number.

5611221165 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

5611221165 is a deficient number, since it is larger than the sum of its proper divisors (4542472275).

5611221165 is a wasteful number, since it uses less digits than its factorization.

5611221165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574.

The product of its digits is 3600, while the sum is 30.

The square root of 5611221165 is about 74908.0847772789. The cubic root of 5611221165 is about 1776.9933213355.

It can be divided in two parts, 56112 and 21165, that added together give a palindrome (77277).

The spelling of 5611221165 in words is "five billion, six hundred eleven million, two hundred twenty-one thousand, one hundred sixty-five".